The use of photovoltaic solar energy as a source for the generation/consumption of electric energy brings benefits from different perspectives, from financial perspectives to encouraging job creation, including environmental issues. Even so, there is still no broad engagement of citizens for solar generation in their homes due to the innovative nature of the product-service, which leaves people with doubts. Given this situation, we proposed the specification of a decision-making support service for joining the Photovoltaic Distributed Generation (GDFV). The design to support citizen decision-making for the GDFV must consider the various reasons that influence people s decision. The attributes that influence citizens in the decision-making process was the object of study. As a methodology, we carried out documentary and bibliographic research on the context of DG in some countries and the state of the art in Brazil, we discussed the new meaning that distributed generation brought to the energy scenario from the management of innovation and mainly through Design Drive-Innovation. (VERGANTI, 2012). We conducted semi-structured exploratory interviews and applied a questionnaire to expand the list of influencing attributes in a nonprobabilistic convenience sample. The results allowed us to build a Map of Attributes, which are the key factors in the decision-making process. We use a series of Service Design techniques to model a decision support service (SATD). Anchored in a web platform, the SATD will allow the union of supply and demand based on a self-diagnosis of the citizen, leading him to the business model that is most adhering to his profile.